<?php
header('Content-type:text/html;charset=uft-8');
function getFileExt($path){
    $ext=substr($path,strrpos($path,'.')+1);
    return $ext;
}
$path='C:\images\apple.jpg';
$ext=getFileExt($path); 
echo "<p>文件路径：$path</p>";
echo "<p>文件后缀：$ext</p>";
